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29 March 2024
 
  » arxiv » astro-ph/0404468

 Article overview


No evidence for Dark Energy Metamorphosis ?
J. Jonsson ; A. Goobar ; R. Amanullah ; L. Bergstrom ;
Date 23 Apr 2004
Journal JCAP09(2004)007
Subject astro-ph
AbstractRecent attempts to fit Type Ia supernova data by modeling the dark energy density as a truncated Taylor series have suggested the possibility of metamorphosis, i.e., a rapidly evolving equation of state parameter, w_DE(z). However, we show that fits using that parametrization have significant problems: evolution of w_DE(z) is both favoured and in some sense forced, and the equation of state parameter blows up or diverges in large regions of the parameter space. To further elucidate these problems we have simulated sets of supernova data in a Lambda-universe to show that the suggested ``evidence’’ for metamorphosis is also common for w_DE=-1.
Source arXiv, astro-ph/0404468
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